Chapter 4 4-21
Start Troubleshooting Here
Receiver (8753ET)
If the source is working, but the A or B input traces appear to be in error, refer to
Chapter 8 , “Receiver Troubleshooting.”
The following symptoms may also indicate receiver failure.
Receiver Error Messages
• CAUTION: OVERLOAD ON INPUT A; POWER REDUCED
• CAUTION: OVERLOAD ON INPUT B; POWER REDUCED
• CAUTION: OVERLOAD ON INPUT R; POWER REDUCED
The error messages above indicate that you have exceeded approximately +14 dBm at one
of the test ports. The RF output power is automatically reduced to −20 dBm (or −85 dBm
for Option 004). The annotation P↓ appears in the left margin of the display to indicate
that the power trip function has been activated. When this occurs, press and enter
a lower power level. Press to switch on the power again.
Faulty Data
Any trace data that appears to be below the noise floor of the analyzer (−100 dBm) is
indicative of a receiver failure.
Power
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